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net.gdface.utils.BinaryUtils Maven / Gradle / Ivy
/**
* @Title: StreamUtilits.java
* @Package net.gdface.utils
* @Description: guyadong
* @author guyadong
* @date 2014-10-21 上午10:51:32
* @version V1.0
*/
package net.gdface.utils;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URL;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* 二进制数据(byte[],ByteBuffer)工具类
* @author guyadong
*
*/
public class BinaryUtils {
private static final String MD5_REGEX = "^[a-fA-F0-9]{32}$";
private static final String HEX_REGEX = "^([a-fA-F0-9]{2})+$";
/**
* 生成MD5校验码
*
* @param source
* @return MD5 byte array
*/
public static final byte[] getMD5(byte[] source) {
if (null ==source){
return null;
}
try {
MessageDigest md = MessageDigest.getInstance("MD5");
return md.digest(source);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
}
/**
* 返回buffer中所有字节(position~limit),不改变buffer状态
* @param buffer
* @return buffer 为 null 时返回 null
*/
public static final byte[] getBytesInBuffer(ByteBuffer buffer){
if(null == buffer){
return null;
}
int pos = buffer.position();
try{
byte[] bytes = new byte[buffer.remaining()];
buffer.get(bytes);
return bytes;
}finally{
buffer.position(pos);
}
}
/**
* 生成MD5校验码
* @param source
* @return MD5 ByteBuffer
* @see #getMD5(byte[])
*/
public static final ByteBuffer getMD5(ByteBuffer source) {
return null == source ?null:ByteBuffer.wrap(getMD5(getBytesInBuffer(source)));
}
/**
* 将16位byte[] 转换为32位的HEX格式的字符串String
*
* @param buffer
* @return HEX string
*/
public static final String toHex(byte[] buffer) {
if (null == buffer){
return null;
}
StringBuffer sb = new StringBuffer(buffer.length * 2);
for (int i = 0; i < buffer.length; i++) {
sb.append(Character.forDigit((buffer[i] & 240) >> 4, 16));
sb.append(Character.forDigit(buffer[i] & 15, 16));
}
return sb.toString();
}
/** @see #toHex(byte[]) */
public static final String toHex(ByteBuffer buffer) {
return toHex(getBytesInBuffer(buffer));
}
/**
* 字符串验证器,根据正则表达式判断字符串是否为十六进制(HEX)字符串
* 输入为null或空或正则表达式不匹配则返回false
*/
public static final boolean validHEX(String input){
return input != null && input.matches(HEX_REGEX);
}
/**
* convert HEX string to byte array
* @param src
* @return byte array or {@code null} if src is {@code null}
*/
public static final byte[] hex2Bytes(String src){
if(null == src){
return null;
}
byte[] res = new byte[src.length()/2];
char[] chs = src.toCharArray();
int[] b = new int[2];
for(int i=0,c=0; i='0' && chs[i+j]<='9'){
b[j] = (chs[i+j]-'0');
}else if(chs[i+j]>='A' && chs[i+j]<='F'){
b[j] = (chs[i+j]-'A'+10);
}else if(chs[i+j]>='a' && chs[i+j]<='f'){
b[j] = (chs[i+j]-'a'+10);
}
}
b[0] = (b[0]&0x0f)<<4;
b[1] = (b[1]&0x0f);
res[c] = (byte) (b[0] | b[1]);
}
return res;
}
/**
* convert HEX string to ByteBuffer
* @param src
* @return byte array or {@code null} if src is {@code null}
*/
public static final ByteBuffer hex2ByteBuffer(String src){
return null == src?null:ByteBuffer.wrap(hex2Bytes(src));
}
/**
* 生成MD5校验码字符串
*
* @param source
* @return MD5 HEX string
* @see #getMD5(byte[])
* @see #toHex(byte[])
*/
public static final String getMD5String(byte[] source) {
return toHex(getMD5(source));
}
/**
* 生成MD5校验码字符串
*
* @param source
* @return MD5 HEX string
* @see #getMD5(byte[])
* @see #toHex(byte[])
*/
public static final String getMD5String(ByteBuffer source) {
return toHex(getMD5(source));
}
/**
* 判断是否为有效的MD5字符串
* @return true/false
*/
public static final boolean validMd5(String md5){
return null != md5 && md5.matches(MD5_REGEX);
}
/**
* 从{@link InputStream}读取字节数组 InputStream getInputStream(T src) throws IOException, IllegalArgumentException {
if(null == src){
return null;
}
if (src instanceof InputStream){
return (InputStream) src;
}else if (src instanceof String) {
return new ByteArrayInputStream(Base64Utils.decode(((String) src)));
} else if (src instanceof byte[]) {
return new ByteArrayInputStream((byte[]) src);
} else if (src instanceof ByteBuffer) {
return new ByteArrayInputStream(getBytesInBuffer((ByteBuffer) src));
} else if (src instanceof File) {
return new FileInputStream((File) src);
} else if (src instanceof URL) {
return ((URL) src).openStream();
} else if (src instanceof URI) {
return ((URI) src).toURL().openStream();
} else{
throw new IllegalArgumentException(String.format("Can't get inputstream from [%s]", src.getClass()
.getCanonicalName()));
}
}
/**
* 将数据对象{@code src}转换为字节数组(byte[]) byte[] getBytes(T src) throws IOException, IllegalArgumentException {
if(null==src){
return null;
}
if (src instanceof byte[]) {
return (byte[]) src;
} else if (src instanceof String) {
return Base64Utils.decode(((String) src));
} else if (src instanceof ByteBuffer) {
return getBytesInBuffer((ByteBuffer)src);
} else if (src instanceof FileInputStream){
return readBytes((FileInputStream)src);
}else if (src instanceof File){
return readBytes(new FileInputStream((File)src));
}else {
return readBytes(getInputStream(src));
}
}
/**
* 调用 {@link #getBytes(Object)}返回非空字节数组 byte[] getBytesNotEmpty(T src) throws IOException {
byte[] imgData = getBytes(src);
if (imgData == null || imgData.length == 0){
throw new IOException(String.format("return null or zero length from %s", src.getClass()
.getSimpleName()));
}
return imgData;
}
/**
* 将数据对象src转换为{@link ByteBuffer}
* @param src 获取byte[]的源对象
* @return 返回字节数组,参数为{@code null}返回{@code null},类型不对则抛出异常
* @throws IOException
* @throws IllegalArgumentException 无法从{@code src}获取{@link InputStream}
* @see #getBytes(Object)
*/
public static final ByteBuffer getByteBuffer(T src) throws IOException, IllegalArgumentException {
return src == null ? null : ByteBuffer.wrap(getBytes(src));
}
/**
* 调用 {@link #getByteBuffer(Object)}返回非空{@link ByteBuffer} ByteBuffer getByteBufferNotEmpty(T src) throws IOException, IllegalArgumentException {
return ByteBuffer.wrap(getBytesNotEmpty(src));
}
/**
* NIO方式将{@code data}数据保存在{@code file}指定的文件中
